117 lines
4.2 KiB
JavaScript
117 lines
4.2 KiB
JavaScript
import { CodedError } from '@unimodules/core';
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import { canUseDOM } from 'fbjs/lib/ExecutionEnvironment';
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import FontObserver from 'fontfaceobserver';
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import { FontDisplay } from './Font.types';
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function getFontFaceStyleSheet() {
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if (!canUseDOM) {
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return null;
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}
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const styleSheet = getStyleElement();
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return styleSheet.sheet ? styleSheet.sheet : null;
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}
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function getFontFaceRules() {
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const sheet = getFontFaceStyleSheet();
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if (sheet) {
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// @ts-ignore: rule iterator
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const rules = [...sheet.cssRules];
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const items = [];
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for (let i = 0; i < rules.length; i++) {
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const rule = rules[i];
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if (rule instanceof CSSFontFaceRule) {
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items.push({ rule, index: i });
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}
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}
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return items;
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}
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return [];
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}
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function getFontFaceRulesMatchingResource(fontFamilyName, options) {
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const rules = getFontFaceRules();
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return rules.filter(({ rule }) => {
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return (rule.style.fontFamily === fontFamilyName &&
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(options && options.display ? options.display === rule.style.fontDisplay : true));
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});
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}
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export default {
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get name() {
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return 'ExpoFontLoader';
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},
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async unloadAllAsync() {
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if (!canUseDOM)
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return;
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const element = document.getElementById(ID);
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if (element && element instanceof HTMLStyleElement) {
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document.removeChild(element);
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}
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},
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async unloadAsync(fontFamilyName, options) {
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const sheet = getFontFaceStyleSheet();
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if (!sheet)
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return;
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const items = getFontFaceRulesMatchingResource(fontFamilyName, options);
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for (const item of items) {
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sheet.deleteRule(item.index);
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}
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},
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async loadAsync(fontFamilyName, resource) {
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if (!canUseDOM) {
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return;
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}
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const canInjectStyle = document.head && typeof document.head.appendChild === 'function';
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if (!canInjectStyle) {
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throw new CodedError('ERR_WEB_ENVIRONMENT', `The browser's \`document.head\` element doesn't support injecting fonts.`);
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}
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const style = _createWebStyle(fontFamilyName, resource);
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document.head.appendChild(style);
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if (!isFontLoadingListenerSupported()) {
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return;
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}
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return new FontObserver(fontFamilyName, { display: resource.display }).load();
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},
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};
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const ID = 'expo-generated-fonts';
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function getStyleElement() {
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const element = document.getElementById(ID);
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if (element && element instanceof HTMLStyleElement) {
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return element;
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}
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const styleElement = document.createElement('style');
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styleElement.id = ID;
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styleElement.type = 'text/css';
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return styleElement;
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}
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function _createWebStyle(fontFamily, resource) {
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const fontStyle = `@font-face {
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font-family: ${fontFamily};
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src: url(${resource.uri});
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font-display: ${resource.display || FontDisplay.AUTO};
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}`;
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const styleElement = getStyleElement();
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// @ts-ignore: TypeScript does not define HTMLStyleElement::styleSheet. This is just for IE and
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// possibly can be removed if it's unnecessary on IE 11.
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if (styleElement.styleSheet) {
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const styleElementIE = styleElement;
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styleElementIE.styleSheet.cssText = styleElementIE.styleSheet.cssText
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? styleElementIE.styleSheet.cssText + fontStyle
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: fontStyle;
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}
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else {
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const textNode = document.createTextNode(fontStyle);
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styleElement.appendChild(textNode);
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}
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return styleElement;
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}
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function isFontLoadingListenerSupported() {
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const { userAgent } = window.navigator;
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// WebKit is broken https://github.com/bramstein/fontfaceobserver/issues/95
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const isIOS = !!userAgent.match(/iPad|iPhone/i);
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const isSafari = /^((?!chrome|android).)*safari/i.test(navigator.userAgent);
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// Edge is broken https://github.com/bramstein/fontfaceobserver/issues/109#issuecomment-333356795
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const isEdge = userAgent.includes('Edge');
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// Internet Explorer
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const isIE = userAgent.includes('Trident');
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// Firefox
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const isFirefox = userAgent.includes('Firefox');
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return !isSafari && !isIOS && !isEdge && !isIE && !isFirefox;
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}
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//# sourceMappingURL=ExpoFontLoader.web.js.map
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